<template>
  <div class="component-upload-image">
    <el-upload
        ref="imageUpload"
        :action="uploadImgUrl"
        :before-remove="handleDelete"
        :before-upload="handleBeforeUpload"
        :class="{ hide: shouldHideUpload }"
        :data="data"
        :disabled="disabled"
        :file-list="fileList"
        :headers="headers"
        :limit="limit"
        :list-type="listType"
        :multiple="multiple"
        :on-error="handleUploadError"
        :on-exceed="handleExceed"
        :on-preview="handlePictureCardPreview"
        :on-success="handleUploadSuccess"
        :show-file-list="true"
    >
      <el-icon class="avatar-uploader-icon">
        <plus/>
      </el-icon>
    </el-upload>
    <!-- 上传提示 -->
    <div v-if="showTip && !disabled && multiple" class="el-upload__tip">
      请上传
      <template v-if="fileSize" >
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
      <template v-if="!multiple">
        (只能上传一个文件)
      </template>
    </div>

    <el-dialog
        v-model="dialogVisible"
        append-to-body
        title="预览"
        width="800px"
    >
      <img
          :src="dialogImageUrl"
          :style="imageStyle"
          style="display: block; margin: 0 auto"
      />
    </el-dialog>
  </div>
</template>

<script setup>
import {computed, getCurrentInstance, nextTick, ref, watch} from 'vue'
import {getToken} from "@/utils/auth"
import {isExternal} from "@/utils/validate"
import Sortable from 'sortablejs'

const props = defineProps({
  modelValue: {
    type: [String, Object, Array],
    default: ''
  },
  // 上传接口地址
  action: {
    type: String,
    default: "/common/upload"
  },
  // 上传携带的参数
  data: {
    type: Object,
    default: () => ({})
  },
  // 图片数量限制
  limit: {
    type: Number,
    default: 5
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["png", "jpg", "jpeg"]
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
  // 禁用组件（仅查看图片）
  disabled: {
    type: Boolean,
    default: false
  },
  // 拖动排序
  drag: {
    type: Boolean,
    default: true
  },
  // 是否支持多选
  multiple: {
    type: Boolean,
    default: true
  },
  // 预览图片宽度
  previewWidth: {
    type: [String, Number],
    default: 'auto'
  },
  // 预览图片高度
  previewHeight: {
    type: [String, Number],
    default: 'auto'
  },
  // 列表类型，支持 picture-card 和 picture
  listType: {
    type: String,
    default: 'picture-card',
    validator: (value) => ['picture-card', 'picture'].includes(value)
  },
  // 缩略图宽度
  thumbWidth: {
    type: [String, Number],
    default: '148px'
  },
  // 缩略图高度
  thumbHeight: {
    type: [String, Number],
    default: '148px'
  }
})

const {proxy} = getCurrentInstance()
const emit = defineEmits(['update:modelValue'])
const number = ref(0)
const uploadList = ref([])
const dialogImageUrl = ref("")
const dialogVisible = ref(false)
const baseUrl = import.meta.env.VITE_APP_BASE_API
const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + props.action) // 上传的图片服务器地址
const headers = ref({Authorization: "Bearer " + getToken()})
const fileList = ref([])

// 计算属性
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize))
const shouldHideUpload = computed(() => {
  if (!props.multiple) {
    return fileList.value.length >= 1
  }
  return fileList.value.length >= props.limit
})
const imageStyle = computed(() => ({
  width: typeof props.previewWidth === 'number' ? `${props.previewWidth}px` : props.previewWidth,
  height: typeof props.previewHeight === 'number' ? `${props.previewHeight}px` : props.previewHeight,
  'max-width': '100%',
  'object-fit': 'contain'
}))

// 监听modelValue变化
watch(() => props.modelValue, (val) => {
  if (val) {
    // 首先将值转为数组
    const list = Array.isArray(val) ? val : props.modelValue.split(",")
    // 然后将数组转为对象数组
    fileList.value = list.map(item => {
      console.log(item)
      if (typeof item === "string") {
        if (item.indexOf(baseUrl) === -1 && !isExternal(item)) {
          item = {name: baseUrl + item, url: baseUrl + item}
        } else {
          item = {name: item, url: item}
        }
      }
      return item
    })
  } else {
    fileList.value = []
  }
}, {deep: true, immediate: true})

// 上传前loading加载
function handleBeforeUpload(file) {
  let isImg = false
  if (props.fileType.length) {
    let fileExtension = ""
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1)
    }
    isImg = props.fileType.some(type => {
      if (file.type.indexOf(type) > -1) return true
      if (fileExtension && fileExtension.indexOf(type) > -1) return true
      return false
    })
  } else {
    isImg = file.type.indexOf("image") > -1
  }

  if (!isImg) {
    proxy.$modal.msgError(`文件格式不正确，请上传${props.fileType.join("/")}图片格式文件!`)
    return false
  }

  if (file.name.includes(',')) {
    proxy.$modal.msgError('文件名不正确，不能包含英文逗号!')
    return false
  }

  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize
    if (!isLt) {
      proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`)
      return false
    }
  }

  // 如果是单文件上传且已经有文件，阻止上传
  if (!props.multiple && fileList.value.length >= 1) {
    proxy.$modal.msgError('只能上传一个文件!')
    return false
  }

  proxy.$modal.loading("正在上传图片，请稍候...")
  number.value++
  return true
}

// 文件个数超出
function handleExceed() {
  const limit = props.multiple ? props.limit : 1
  proxy.$modal.msgError(`上传文件数量不能超过 ${limit} 个!`)
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  if (res.code === 200) {
    uploadList.value.push({name: res.fileName, url: res.url})
    uploadedSuccessfully()
  } else {
    number.value--
    proxy.$modal.closeLoading()
    proxy.$modal.msgError(res.msg)
    proxy.$refs.imageUpload.handleRemove(file)
    uploadedSuccessfully()
  }
}

// 删除图片
function handleDelete(file) {
  const findex = fileList.value.map(f => f.name).indexOf(file.name)
  if (findex > -1 && uploadList.value.length === number.value) {
    fileList.value.splice(findex, 1)
    emit("update:modelValue", listToString(fileList.value))
    return false
  }
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value)
    console.log(fileList.value)
    uploadList.value = []
    number.value = 0
    emit("update:modelValue", listToString(fileList.value))
    proxy.$modal.closeLoading()
  }
}

// 上传失败
function handleUploadError() {
  proxy.$modal.msgError("上传图片失败")
  proxy.$modal.closeLoading()
}

// 预览
function handlePictureCardPreview(file) {
  dialogImageUrl.value = file.url
  dialogVisible.value = true
}

// 对象转成指定字符串分隔
function listToString(list, separator = ",") {
  let strs = ""
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
      console.log(list[i].url)
      strs += list[i].url + separator
    }
  }
  return strs !== "" ? strs.substr(0, strs.length - 1) : ""
}

// 初始化拖拽排序
onMounted(() => {
  if (props.drag && !props.disabled) {
    nextTick(() => {
      const element = proxy.$refs.imageUpload?.$el?.querySelector('.el-upload-list')
      if (element) {
        Sortable.create(element, {
          onEnd: (evt) => {
            const movedItem = fileList.value.splice(evt.oldIndex, 1)[0]
            fileList.value.splice(evt.newIndex, 0, movedItem)
            emit('update:modelValue', listToString(fileList.value))
          }
        })
      }
    })
  }
})
</script>

<style lang="scss" scoped>
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}

:deep(.el-upload.el-upload--picture-card.is-disabled) {
  display: none !important;
}

.component-upload-image {
  // 调整上传按钮和缩略图大小
  :deep(.el-upload--picture-card),
  :deep(.el-upload-list__item) {
    width: v-bind('typeof props.thumbWidth === "number" ? `${props.thumbWidth}px` : props.thumbWidth');
    height: v-bind('typeof props.thumbHeight === "number" ? `${props.thumbHeight}px` : props.thumbHeight');
    line-height: v-bind('typeof props.thumbHeight === "number" ? `${props.thumbHeight}px` : props.thumbHeight');
  }

  // 调整上传图标大小
  .avatar-uploader-icon {
    font-size: 28px;
    color: #8c939d;
  }

  // 隐藏上传按钮的样式保持不变
  :deep(.hide .el-upload--picture-card) {
    display: none;
  }

  :deep(.el-upload.el-upload--picture-card.is-disabled) {
    display: none !important;
  }
}
</style>
